Posted at 21:55
Who is the referee?
Brazil v Mexico (15:00 BST)
Today's main man is Italy's Gianluca Rocchi.
He took charge of the opening game in Group B, the 3-3 draw between Portugal and Spain, and awarded that penalty to Portugal after just four minutes.
He also made history in that match by consulting VAR for the first time at a World Cup.
He's given out seven yellow cards so far in the tournament, making him one of the more lenient referees - good news for those four players already on yellow cards.